Download Product loadability

Product loadability
Problematic choice of suitable relay contact for a particular load switched with a product is described below.
Mostly we experience problems with incorrect choice of load (meaning incorrect relay for a particular load) which results in permanent switching of contact (sealing) or damage on relay contact – which
then results in malfunction.
What load can you use?
Detailed types of load according to standard EN 60947 are described in charts below – categories of use.
Category of use
AC current, cosφ = P/S (-)
AC-1
Typical use
Non-inductive or slightly inductive load, resistance furnace
Includes all appliances supplied by AC current with power factor (cos .) 0,95.
Examples of use: resistance furnace, industrial loads
AC-2
AC-3
EN
Motors with slip-ring armature, switching off
Motors with short-circuit armature, motor switching when in operation
This category applies to switching off motors with short-circuit armature while in operation. While switching, contactor switches current which is 5 up to 7 times
rated current of motor.
AC-4
AC-5a
AC-5b
Electro-motors with short-circuit armature: start up, braking by backset, changeover
Switching of electrical gas-filled lights, fluorescent lights
El. bulb switching
AC-6a
AC-6b
AC-7a
AC-7b
AC-8a
Switching of transformers
Switching of capacitors
Switching low inductive loads of home appliances and similar applications
Load of motors for home appliances
Switching of hermetically sealed motors of cooling compressors with manual reset switches against overload
AC-8b
Switching of hermetically sealed motors of cooling compressors with manual reset switches against overload
60947-4
60947
60947-4
60947
60947-4
60947-4
Enables low contact loading due to resistance of cold fiber is many times smaller that the one of hot fiber.
60947-4
60947-4
60947
60947
60947
Hermetically sealed cooling compressors have to be placed in one box without external shaft or shaft padding and motor must operate with cooling liquid
60947
Hermetically sealed cooling compressors have to be placed in one box without external shaft or shaft padding and motor must operate with cooling liquid
AC-12
AC-13
AC-14
AC-15
Switching of semiconductor loads with separation transformers
Switching of semiconductor loads with separation transformers
Switching of low electro-magnetic loads (max.72 VA)
Management of alternating electro-magnetic loads
This category applies to switching inductive loads with input for closed electro-magnetic circuit higher than 72 VA
Use: switching coils of contactors
AC-20
AC-21
AC-22
AC-23
AC-53a
TECHNICAL INFORMATION
DC current, t = L/R (s)
DC-1
DC-3
DC-5
DC-6
DC-12
DC-13
DC-14
DC-20a(b)
DC-21a(b)
DC-22a(b)
DC-23
Connecting and disconnecting in unloaded states
Switching resistive loads, including low loading
Switching of mixed resistive and inductive loads, including low overloading
Switching of motor loads or other high inductive loads
Switching of motors with short-circuit armature with semiconductor contactors
Note: Category AC 15 replaces formerly used category AC 11
Non-inductive or low inductive load, resistive furnaces
Shunt motors: start-up, braking by backset, reversion, resistive braking
Series motor: start-up, braking by backset, reversion, resistive braking
Non-inductive or low inductive loads, resistive furnaces – el. bulbs
Management of resistive loads and fixed loads with insulation by opto-electric element
Switching of electromagnets
Switching of electromagnetic loads in circuits with limiting resistor
Switching and breaking without load(a: frequent switching ,b: occasional switching)
Switching ohmic loads including limiting overloading (a: frequent switching ,b: occasional switching)
Switching of highly inductive loads (e.g. series motors)
60947-5
60947-5-1
60947-5-1
60947-5
60947-3
60947-3
60947-3
60947-3
60947
60947-4
60947-4-1
60947-4-1
60947-4-1
60947-5-1
60947-5-1
60947-5-1
60947-3
60947-3
60947-3
60947-3
How can you distinguish for which load is our product (relay) designated?
Our company record this information on a products and also in our catalogue, instruction manual and other promotional and technical material (web-site etc.).
It is important to realize that it is not always possible to point out load because of lack of information about the device ( user cannot measure cos .) or it is not possible because of inconstancy of parameters
of switched device.
Manufacturer of relays record always guaranteed parameters in ideal conditions which are done by a norm (temperature, pressure, humidity, etc.) and reality can be in a lot of cases different.
Category of use (classification) of a particular relay is done by material of output contacts.
Basic types of materials which are used for production of contacts for high-performance relay are:
a)AgCd – suitable for switching ohmic loads. Before of harmfulness of Cd, this type of contact is remitted.
b)AgNi –designated for switching resistive loads , good quality switching and conducting (contact doesn’t oxidate) small currents/voltages ,it is not designated for surge currents and loads with inductive
component
c)AgSn or AgSnO –suitable for switching loads with inductive component , not suitable for switching small currents/voltages, it is more resistive to surge currents, suitable for DC voltage switching,
less suitable for switching loads of ohmic type
d)Wf (wolfram)-special contact designated for switching surge currents with inductive component
e)with gold (AgNi/Au)- it is used for “improving” contacts for low currents/ voltages , prevents oxidation.
96
Product loadability
LOAD
RELAY CONTACT
16 A
AC5a
AC5a
AC5a
AC5a
AC1
AC3
AC15
DC1
(24/110/220 V)
1000 W
1000 W
750 W
500 W
4000 VA
0.9 kW
750 VA
16 A/0.5 A/0.35 A
AC15
DC1
(30/110/220 V)
×
125 VA
10 A/0.49 A/0.33 A
10
AC5b
2000 W
AgSnO2
It is valid for foolowing products: CRM-4, CRM-42, SHT-1, SHT-1/2, SHT-3, SOU-1, MR-41, MR-42, VS116K, VS316, VS116U, VS316/24, VS316/230, TER-3, SMR-B
LOAD
RELAY CONTACT
8A
10
AC5b
AgNi
AC5a
AC5a
AC5a
AC5a
×
×
×
×
500 W
AC1
AC3
2500 VA
It is valid for foolowing products: CRM-61, SOU-2, HRN-54, HRN-54N, HRN-55, HRN-55N, HRN-56, HRN-57, HRN-57N PRI-32, PRI-51, TER-9
LOAD
RELAY CONTACT
16 A
AC5a
AC5a
AC5a
AC5a
AC1
AC3
AC15
DC1
(24/110/220 V)
×
×
×
×
4000 VA
0.9 kW
750 VA
16 A/0.5 A/0.35 A
10
AC5b
AgNi
1000 W
It is valid for foolowing products: CRM-81J, CRM-91H, PRM-91H, CRM-91HE, CRM-2HE, CRM-2H, CRM-2T, PDR-2/A, PDR-2/B, SJR-2, HRH-2, HRN-33, HRN-34, HRN-35, HRN-37, HRN-41, HRN-42,
HRN-43, HRN-43N, HRN-63, HRN-64, HRN-67, PRI-41, PRI-42, HRH-1, COS-1, TER-4, TEV-1, TEV-2, TEV-3, Thermo
LOAD
RELAY CONTACT
8A
AC5b
AgNi
AC5a
AC5a
AC5a
AC5a
AC1
AC3
AC15
DC1
(24/110/220 V)
×
×
×
×
2000 VA
×
375 VA
8 A/0.4 A/0.25 A
AC1
AC3
AC15
DC1
(24/110/220 V)
1250 VA
×
0.75 A/ 240 V
5 A/0.5 A/0.3 A
500 W
10
It is valid for foolowing products: CRM-83J, CRM-93H, PRM-92H, PRM-2H, CRM-82TO, VS308K, VS308U, TER-7
LOAD
RELAY CONTACT
3A
10
AC5b
AgNi
AC5a
AC5a
AC5a
AC5a
×
×
×
×
500 W
It is valid for foolowing products: CRM-2T/480
MINIMUM LOAD
RELAY CONTACT
AgSnO2
LOAD
MINIMUM LOAD
mW
V / mA
1000
10/100
LAMP,
HALOGEN LIGHT
LOW-VOLTAGE EL.BULBS 12-24V
WOUND TRANSFORMERS
RESISTIVE
R
INDUCTIVE
L
RELAY CONTACT
AgNi
LOW-VOLTAGE EL.BULBS 12-24V UNCOMPENSATED FLUORESCENT
LAMPS
ELECTRONIC TRANSFORMERS
EKONOMIC FLUORESCENT
LAMPS
mW
V / mA
300
5/10
SWITCHING MANAGEMENT
SWITCHING MANAGEMENT
CAPACITIVE
C
ACCORDING
TO BALLAST
ACCORDING
TO BALLAST
INCLINE EDGE
DESCENDING EDGE
SMR-T
×
×
×
×
×
SMR-H
×
×
×
×
×
SMR-B
×
×
×
TYPE OF LOAD
SYMBOLS
COMMENTS
97
AC5b
lamp,
halogen light
AC5a
uncompensated
fluorescent lamps
AC5a
compensated
fluorescent lamps
in series
10
AC5a
AC5a
R, L, C
AC-1
compensated
fluorescent lamps
in parallel
ekonomic
fluorescent lamps
Dimmer with defi ned
load: R - resistive
L - inductive
C - capacitive
Non-inductive or
low-inductive loads,
resistive
furnance
AC-3
Squirrel-cage
motors, switching
of motors in
operation
AC-15
Controlling of
alternative
electro-magnetic
loads
DC-1
Non-inductive or
low-inductive loads,
resistive furnances
TECHNICAL INFORMATION
(symbols)